Hello, i had the same problem with you . 
Server OS :Windows Server 2008
memcached 1.4.15
there are many CLOSE_WAIT.and memcached dosent work.
did you resoleved this issue?
Thanks.

在 2013年9月30日星期一 UTC+8下午11:36:18,Nic Jansma写道:
>
> Using memcached 1.4.15
>  
> Over the past few months I've been having a few issue with memcached, 
> notably the issue here: 
> http://code.google.com/p/memcached/issues/detail?id=260
>  
> However, another, maybe related issue, is that once every few days, 
> clients (websites running PHP) cannot connect to the localhost memcached 
> instance.
>  
> I'm running with a connection limit of 4096:
> memcached -d -p 11211 -m 1024 -c 4096 -P /var/run/memcached/memcached.pid 
> -l 127.0.0.1 -k
>  
> When the error started happening today, I looked at the log and see 
> several "Too many open connections" lines.  Here's the first one:
> ...
> >4094 Writing bin response:
> ...
> <4094 connection closed.
> Too many open connections
> ...
>  
> Connection #4094 is right around my 4096 connection limit...
>  
> Looking at netstat and lsof, I see around 4000 connections -- most of them 
> are in CLOSE_WAIT.
>  
> lsof:
> ...
> memcached 477 root 1366u  IPv4          622713568        0t0       TCP 
> localhost:memcache->localhost:43324 (CLOSE_WAIT)
> memcached 477 root 1367u  IPv4          622713571        0t0       TCP 
> localhost:memcache->localhost:43325 (CLOSE_WAIT)
> ...
>  
> netstat:
> ...
> tcp       39      0 localhost:memcache          
> localhost:45768             CLOSE_WAIT
> tcp       25      0 localhost:memcache          
> localhost:42766             CLOSE_WAIT
> ...
>  
> The rest of the connections are in FIN_WAIT1, ESTABLISHED, etc, but the 
> vast majority are the ~4,000 CLOSE_WAIT connections.
>  
> I'm going to try bumping up the connection limit to 32k to avoid this for 
> now, but clearly there's something going on where memcached isn't closing 
> connections.
>  
> How can I debug this further?
>

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